Screencasts - Record only one screen

According to: https://help.gnome.org/users/gnome-help/stable/screen-shot-record.html.en

We can record our screens using Ctrl+Alt+Shift+R, works very well. But I have 2 screens or monitors. When recording, the software captures both screens, but I only need to capture one.

How can I record only one screen?

Solution 1:

Install Kazam, it's a great tool to record single/multiple screens
Install Kazam in Ubuntu

sudo apt install kazam

If you want to install the newer Kazam 1.5.3, you can use unofficial PPA that is available for Ubuntu 18.04 and 16.04:

sudo add-apt-repository ppa:sylvain-pineau/kazam
sudo apt-get update
sudo apt install kazam

You also need to install a few libraries in order to record the mouse clicks and keyboard presses.

sudo apt install python3-cairo python3-xlib

Source here